Charles s



Patented nec. 2o, |898.

c..E. scmuen.

MAGNETIC SWITCH.

(Apphcntxon led Apr 23, 1897 No. e|6,|4s.

(No Model.)

Inventur: @a/dw Witnesses;

I UNITED STATES PATENT OFFICE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WESTERN ELECTRIC COMPANY, `OF SAME PLACE.

AMAGNETIC SWITCH.A

srncrrrcnfrron forming pm of Letters Patent No.

616,148, dated recenter 20,1898.

Application led April 23,1997.- Serial Nordki. l (No model.)

To all whom it may concern:

Beit known that I, CHARLES E. Scrum-IER, a citizen ofthe United States, residing at Chicago, in the county ofCook and State of Illinois, have invented a certain new and useful Improvement in Magnetic Switches, (Case No. 443,) of which the following is a full, clear, concise, and exact description, reference being had t'o the accompanying drawings, forming a part of this specification.

My invention is a plug-seat switch for use in telephone-switchboards. Its object is to provide an appliance in which the presence of the plug in cr adjacentv to its socket shall determine the application to the switch-contacts controlled by the plug' of a force much greater than the weight of the plug and its attachments. To this end I employ an armature or body ofy magnetic material controlling switch-contacts and a magnet adapted to attract and move the armature, the application of the magneticforce to the armature being determined by the presence of the plug in its resting-socket.

A feature of, the invention consists in ahew magneto-mechanical device, which I make use of as affording a peculiarly efficient form for the plug-seat switch. This comprises a permanent magnet, a movable armature therethr, and a removable section of magnetic material normally forming part of 'the magnetic circuit of themagnet. The permanent magnet, the armature, and the switch-l contacts controlled by the armature may be located in suitable fixed positions in the switchboard. The removable section of magnetic material may be a block or ring of iron associated wither forming part of `the coilnecting-plug and adapted to be brought into position to fill a and varmature to increase the attraction of the vformer upon in its socket. y

The useof the permanent magnet and the above-described means for employing its attraction upon the armature to move switchf contacts 'permits the application to the switchcontacts of a force much greater than the weight `of the plug and its attachments 5o through the agency of the plug. It also perspace between the magnetv the latter when the plug is v mits the iuclosure of the switch-contacts and the moving parts in a sealed case, wherein they may be protected from dust and corrosion.

The invention is shown drawings.

In the drawings, Figure 1 represents a plan of the plug-seat switch and plug. Fig. 2 is a vertical central sectional View of the plugseat switch. Fig. 3 represents a transverse section taken on line 3 lot Fig. 2. Fig. 4 is a`ront elevation of the appliance, the case incl'osing the moving parts being shown in vertical section on line 4 -l of Fig. 2.

T he plug-seat switch comprises a suitable base or frame a, adapted for attachment to the under side of the plug-shelf b, usual in telephone switchboards. In this frame is formed va vertical tubular perforation a', which opens into a socket or seat a? for the Aplug at its upper extremity. The plug c is designed to rest in this socket, projecting through the plug-shelf b and being accessible from the upper surface thereof, the flexible conductor attached to the plug being passed through the openi-nga. This frame carries .Sa/permanent magnet d, one of whose extremities projects into or near the socket a2 and whose other extremity is brought intojuxtaposition to a movable armature e, whose up- "per extremity lies near socket a2.

The plug c may be in general of any usual construction',but carries atits lower extremity lVhen the plug c rests in its socket, or quite extremi- At such material. the collar cis designed to nearly bridge the space between the upper ties of magnet d and armature e. time the magnet complete rectangular circuit of magnetic material,4

The armature -e lies in a recess a3 of the `frame a and is pivoted therein upon trunnions f and f', which extend through the walls of the recess and engage the lowerend of the armature. `In the same recess and adjacent contact-anvil h, suitabl supported at their ,lower extremities in a lockof insulating material, lling the lower endof the recess a".

1iu the attached d'forms apart of a nearly v to the armature lie a switch-spring g and its' a ring or collar c' of iron or other magnetic lli The switch-spring g is given tension away from the armature c and toward its contactpiece 71, but it is in mechanical connection with the armature through an insulating-pin e. The tension of the spring is so adjusted to the strength of the magnet d that when the plug is removed from its socket, leaving the space between the pole of the magnet and the armature vacant, the spring draws the armature away from the magnet and closes upon its contact-anvil 7L'. Any other desired arrangement of the contact-pieces may of course be made whereby the movement of the armature may be caused to change circuits.

The recess ag is covered and sealed by a plate I, fitting over it and secured to the frame by screws. Thus the moving parts and lthe switch-contacts of the plugseat switch are completely inclosed and protected from dust and corrosion.

'hen the plug 1s in its socket, the upper pole ot magnet d is extended, so to speak, toward the armature c, so that the latter is attracted and moves the switch-spring g away from its contact-piece i. ll'hen the plug is removed from its socket, the circuit of magnetic material is widely broken and the spring is permitted to close upon its contact, retracting the armature f in iis movement. The force exerted upon the switch-spring is obviously independent of the weight of the plug, being determined by the attraction of magnet 'l upon its armature.

This invention is not limited to the particular device by which the torce of attraction of the magnet is applied to the armature to move the switch-springs, inasmuch as other dispositions of the magnet and armature might be made whereby the removal of the ping from its socket would diminish the attraction between a magnet and armature to permit movement of the armature. Neither the utilityof thedevicecomprsingthe magnet, movable mature, and the removable section of i .etic material confined to its n e in plug the D creation wit soc arr t. switelieoiitacts controlled thereby i the socket, a plug and a mass i-iagnctic mat associated therewith,

said mass of mag ,etie material or said arman ture being magnetized, whereby the armature is moved when the plug is in its socket, as described.

The combination with a base and a socket formed therein for a connecting-plug, of a plug in the socket, an armature adjacent to the socket, switch-contacts controlled by the armature, and a mass of magnetic material moved in the movement of the plug adapted to attract said armature to operate the switch-springs, as described.

3. The combination with a base and a socket formed therein for a plug, of an armature near the socket, and switch-con tacts controlled thereby, a case inclosing said armature and switch-contacts, a plug in 'die socket and a mass of magnetic material associated therewith to be moved when the plug is rcmoved from the socket, either said mass of magnetic material or said armature being magnetized to attract the other when said plug is in its socket, substantially as described.

4. The combination of a permanent magnet, an armature therefor, switch-contacts controlled by the armature, a pole-piece of soft iron for said magnet presented to the armature, said pole-piece being removable and associated with a movable appliance, substantially as described.

5. The combination of a permanent niagnet, an armature and switchcontacts controlled by the armature, said magnet and armature being separated by a considerable space, and a connectingplug and a mass of iron associated therewith, said mass of iron being adapted to bridge the space between the magnet and the armature to cause the movement of the armature when the plug is in proper position, as described.

G. The combination with a base having a socket formed therein, of a permanent magnet having its pole adjacent to the socket, and an armature therefor also near the socket, switch-contacts controlled by the armature, and a plug and a mass of iron carried thereon adapted to nearly bridge the space between the magnet and the armature when the plug is in its socket, substantially as described.

In witness whereof I hereunto subscribe my name this 25th day of January, A. D. ISO?.

CHARLES E. SCRIBNER.

",fifitnesses:

ELLA-i EDLEn, MYRTA F. GREEN.

ICO 

